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Changes to the Body

by Thad Wilson, PhD
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    What are the neurological changes that occur? These mainly have to do with the brain size and the amount of myelination that occurs on axons. Let's look at a couple of the different years and go through some of the responses. So at 40 weeks we're about at 400 g. It's pretty rapid in terms of a gain to about 1000 g within the first year. It then tapers off some that the rate arise and when you get into adolescence maybe you're somewhere around 1250 to 1400. Myelination is going to be occurring throughout childhood. It depends on the various structure that we're dealing with how quickly it takes to myelinate but this is one reason why coordination develops and some other brain functions work a little bit better as one is maturing. Other neurological changes that happen are being able to regulate one's own body temperature. In fact, there is a circadian rhythm associated with temperature regulation and early on within the first few months you have a lower nightly temperature but when 3-6 months that magnitude starts to change and finally it takes all the way to about year 2 to maybe even 5 before the adult normal circadian rhythm is very Asian is able to be observed. Infants also have an impaired ability to shiver. They don't have good muscle coordination as of yet so therefore they can't utilize shivering in thermogenesis. What they do use, however, is something called brown adipose tissue. So they are brown adipose tissue sites especially around some of the large organs that go through a futile cycle in which in response to norepinephrine there is increased heat production. The final thing that's different for thermoregulation as a child develops is their surface area to mass ratio. The more surface area...

    About the Lecture

    The lecture Changes to the Body by Thad Wilson, PhD is from the course Human Development. It contains the following chapters:

    • Neurological Changes
    • Thermoregulation
    • Cardiovascular Changes
    • Changes in the Lung
    • Renal Changes

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    Author of lecture Changes to the Body

     Thad Wilson, PhD

    Thad Wilson, PhD


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